Carbureter.



F. W.- HODGES.

' CARBURETER APPLICATION FILED MAY 3. I915.

Patented Nov. 2, 1915.-

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F. W. HODGES.' -CARBURETER.

APPLICATION FILED MAY 3. I9l5.

Patented Nov. '2, 1915.

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FREDERICK W. HODGES, OF DETROIT, MTCHIGAN, ASSIGNOR TO DETROIT LUBRICATOR COMPANY, 013' DETROIT, MIGI -IIG'AQ A'- CORPOR ATION OF MICHIGAN.

. cnimuititrnit Patented Nov. 2, 1915.

Application filed Ma a, 1915. Serial No. 25,483.

Toall whom it may concern:

Be it known that I, FREDERICK W. HoDoEs, a citizen of the United States of America,

' residing at Detroit, in the county of \Vayne and State 'of Michigan, have invented certainnew and useful Improvements in Carbu'reters, of which the following is a specification, reference being had thereinto the" accompanying drawings.

.The invention relates to carburet'ers of that type in which the flow of the liquid fuel into the mixing chamber is regulated by a metering pin and a cooperating airvalve.

It is .the object of the inventionto obtain a construction in which there is an instantaneous response to the opening of the throttle by a 'correspondin'g increase in the flow of liquid, and also one in Y which there is a. similar response to the closing of the throttle by an instantaneous checking of the flow of the liquid. Thus the construction is one which avoids the starving'of the mixture when the throttle is quickly opened, and the choking by over-enrichment when the throttle is quickly closed.

In the drawings: Figure 1 is a longitudinal section through the carbureter when the throttle is in closed or idling position; Fig.

initially rests upon an annular seat F at the lower end of the mixing chamber; The

. valve is also provided with a stem G slid ably engaging a tubular guide H in the casing, and having a .central passage I for the oil or liquid fuel that enters the mixing chamber. a

J is a tapering metering pin extending into the passage I and cooperating with the stem G to vary the restriction of the oil passage in different positions of adjustment of the valve D. l 1

With. the construction as thus .far described, whenever there is an air suction communicated to the mixing chamber B the the sudden opening. of the throttle the valve D will be lifted from its seat, permit ting the flow of air into said chamber, and simultaneously the liquid fuel will enter through the passage 1, its flow being controlled by the metering pin J. This will normally'proportion the flow of the liquid to that of the air where there is a gradual opening or closing of the throttle, but upon greater inertia. and frictionalresistance of with the sudden increase in flow of air, so

that a lean mixture results. To avoid this result I have provided a dash-potfor resisting the sudden upward movement of the valve D, and have utilized the resistance of the dash for adjusting the metering pin to permit increased flow of the liquid. The construction is also such that the suction of the dash is almost instantaneously relieved which avoids flooding or an over-rich mixture,

The specificv construction preferably employed for accomplishing the result as above described is the arrangement of-a cylinder or dash-pot K below the air-inlet C and in communication through a passage L' with the float-controlled oil chamber M. Within this cylinder or dash-pot is a piston N which is connected to the stem G, and is therefore adjusted with each movement of the valve'D.

O is a cylindrical recess formed inthe lower portion of the stem G for receiving a piston P which is mounted upon the metermg pin.

Q is a shank for the metering pin passing through an adjustable bearing R- and having a spring S sleeved thereon between thepiston and said bearing. Ajpin Q, carried by. the lower end of the shank Q is adapted to bear against the lower end of R to limit upward displacement of the piston P and metering pin, without restricting downward. 100

' \Vith the construction just described the 9 cylinder or dash-pot K has a vent connection I with thecylindrical recess-O above the piston P, formed by ports 0', and the piston 'N is provided with such clearance within the cylinder K as to permit a slow leakage of 110 the liquid will prevent it from keeping pace 7 upon cessation of-movement of the valve D,

- a gradual rise is still permittedby the leakage of the liquid about the piston N. \Vhenever there is a sudden rise of the valve D, due to the sudden opening of the throttle, the suction of the dash-pot which is communicated to the piston P will draw the latter downward in the cylinder 0 against the resistance of the spring S, and. by lowering the metering pin J will increase the flow of the oil. This will continue as long as the throttle E is being opened, but the instant that the throttle assumes a stationary position further upward movement of the valve D is prevented. and the leakage of liquid about the piston N will equalize the pressure above andbelow the piston P, permitting the spring S to again restore said piston and the metering pin J to normal posit-ion This normal. position of the metering pin is unaffected by the position assumed by the valve D, nor is it affected to as great an extent by the gradual movement of said valve. It is only when there is a sudden movement upward that the dash-pot becomes effective to draw the piston P downward and to displace the metering pin.

In idling position or where the valve D is seated, the air passes through channels U in the valve head, and is discharged adjacent to the nozzle end V of the passage I; but this construction forms no part of the present invention.

What I claim as my invention is 1. In a carbureter, the combination with a casing containing the mixing chamber, of a valve controlling the air inlet to said chamber, a nozzle for discharging the liquid fuel into said chamber, means for varying the flow of the liquid fuel with each change in position of the air valve, and means for additionally increasing the fiow of the oil upon a sudden opening of said air valve and for restoring the normal flow upon the cessation of said sudden movement;

2. In a carbureter, the combination with a casing containing the mixing chamber, of an automatic valve, controlling the air inlet to said chamber, a nozzle for discharging liquid fuel into said chamber, a metering pin and cooperating means carried by said automatic valve for variably restricting the flow of liquid fuel to said nozzle in different positions of adjustment of said valve, a dash-pot for resisting the sudden opening of said automatic valve, means actuated by the suction of said dash-pot for adjusting said metering pin to further increase the flow of liquid fuel, and means for quickly returning said metering pin to its normal position upon cessationof the suction of said dash-pot.

. 3. In a carbureter, the combination with a casing containing the mixing chamber, of

an automatic valve controlling the air inlet to said chamber, a nozzle for discharging liquid fuel into said chamber, a metering pin and cooperating means carried by said automatic valve for variably restricting the flow of liquid fuel to said nozzle, a suction dash pot for resisting the sudden opening of said valveadapted to quickly lose its suction upon cessation of movement of saidvalve,

means actuated by the suction of the. dash potfor adjusting said metering pin to further increase the flow of the liquid, and means for quickly restoring said metering pin when said suction ceases.

-l. In a carbureter,'the combination with a casing containing the mixing chamber, of an automatic valve for controlling the air inlet to said chamber, a nozzle for discharging liquid fuel into said chamber carried by said valve, a stem for said valve having a passage therethrough for the liquid to said nozzle, a piston on said stem, a stationary cylinder for said piston, cooperating therewith to constitute a dash-pot, a cylindrical recess in said stem andpiston, a piston in said recess, a metering pin mounted on said latter piston and variably restricting the passage through said stem in different positions of adjustment of said valve, and means for yieldably holding said metering pin and its piston stationary, permitting movement thereof under the suction of said dashot to temporarily increase the flowof li-quid 5. In a carbureter, the combination with a casing containing the mixing chamber, of an automatic valve controlling the air inlet to said chamber, having a stem with a passage therethrough for the liquid fuel, a piston on said stem, a stationary cylinder for said piston cooperating therewith to form a dash-pot, a similar piston engaging a cylindrical recess in said large piston and stem, a metering pin carried by said small piston for variably restricting the liquid passage through said stem, a stem depending from said small piston, a spring sleeved thereon, and an adjustable member forming a. guide for said stem and an abutment for said spring, for the purpose described.

6. In a carbureter, the combination With 7 a casing containing the mixing chamber, of

for discharging liquid fuel into said chamher, a piston and cyhnderformmg a dash-- pot, means operating upon a sudden inactuated by said second piston for varying the supply of oil to said nozzle.

8. In a carbureter, the combination with a casing containing a mixing chamber, a 'alve controlling anair inlet into said chamber, a nozzle for discharging liquid fuel into said chamber, a dash-pot for resisting the sudden opening of said air valve and comprised of a cylinder and piston, a

second piston axially movable within thedash-pot piston and actuated by motion of the dash-pot pistonfand means operating upon a displacement of the second'piston for varying'the'fuel supply to the nozzle.

9. In a carbureter, the combination with a casing containing a mixing chamber, and an-air' chamber, of an automatic valve controlling an inlet to the mixing chamber, a cylinder adjacent the air chamber, a stem extending from said valve through the air chamber andinto said cylinder, a piston carried by the stem within said cylinder, said piston and cylinder forming a dash-pot, means for supplying liquid fuel-to the mixing chamber, and means acting-upon a displacement of said piston in its cylinder to vary the fuel supply to the mixing chamber,

10. In a carbureter, the combination with a casing having a mixing chamber, of a valve automatically controlling an air inlet to said chamber, a stem extending from said valve formed with a passage for conducting liquid fuel to the mixing chamber, and formed with a chamber in communication with said passage,'a piston mounted in said chamber, means for restricting said passage connected with the piston, and means actuated'by a displacement of said valve, producing an opposite displacement of said piston.

In testimony whereof I aflix my signature in presence of two witnesses.

FREDERICK IV. HQDGES.

\Vitnesses: I

J Aims P. BARRI, HENRI E. BOWMAN. 

